inotify registration ignores .mpdignore

[madduck]

Bug report

Describe the bug

The auto_update inotify registration does not respect .mpdignore files.

% grep ^music_directory ~/.config/mpd/mpd.conf 
music_directory		"/media/kids"

% cat /media/kids/.mpdignore
lost+found

Expected Behavior

If I put a file/dir into .mpdignore, I expect it to not be scanned. Therefore, I don't expect an inotify hook to be registered.

Actual Behavior

The hook is being registered, and the logs spammed…

Version

Music Player Daemon 0.21.22 (0.21.22)
Copyright 2003-2007 Warren Dukes <warren.dukes@gmail.com>
Copyright 2008-2018 Max Kellermann <max.kellermann@gmail.com>
This is free software; see the source for copying conditions.  There is NO
warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Database plugins:
 simple proxy

Storage plugins:
 local smbclient nfs

Neighbor plugins:
 smbclient

Decoders plugins:
 [mad] mp3 mp2
 [vorbis] ogg oga
 [oggflac] ogg oga
 [flac] flac
 [opus] opus ogg oga
 [dsdiff] dff
 [dsf] dsf
 [hybrid_dsd] m4a
 [pcm]

Filters:
 libsamplerate

Tag plugins:
 id3tag

Output plugins:
 null fifo pipe alsa pulse httpd recorder

Encoder plugins:
 null vorbis opus wave flac

Input plugins:
 file alsa curl smbclient nfs

Playlist plugins:
 extm3u m3u pls xspf asx rss flac cue embcue

Protocols:
 file:// alsa:// http:// https:// smb:// nfs://

Other features:
 epoll inotify ipv6 systemd tcp un

Log

That first line shouldn't be there either:

Apr 29 11:12 : exception: Failed to open /media/kids/lost+found: Permission denied
Apr 29 11:17 : exception: Failed to register /media/kids/lost+found: inotify_add_watch
() has failed: Permission denied
[…] # and about 35 more.